JPH10233059A - Device and method for recording/reproducing image data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a seeking distance and seeking time shortest for reproducing a plurality of image data recorded in a discontinuous recording area. SOLUTION: Based on continuous sector numbers added to the sectors of a disk recording medium such as a magneto-optical(MO) disk, recording areas where image data to be reproduced are recorded are sorted and reproduced. For example, if the sector numbers of the head sectors of image data recording areas (a) to (d) are 0100h, 7000h, 0200h and 6000h respectively, during reproduction of compressed image data, the recording areas (a) to (d) are sorted such that the sector numbers of the head sectors of the recording areas (a) to (d) are monotonously increased and, as shown in (b), reproduction is made in the order of the recording areas (a), (c), (d) and (b). Further, the reproduced image data are subjected to buffering, returned to the original reproduction order of (a) to (d) and then outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magneto-optical (MO;
Image data recording / reproducing apparatus and method for recording image data on a recording medium such as a disk and a hard disk (HD), accessing the recording medium to minimize the seek distance, and reproducing the recorded image data About.

[0002]

2. Description of the Related Art Image data of a moving image is recorded on a randomly accessible recording medium such as an MO disk and a hard disk, and image data of an arbitrary part of the arbitrary image data is recorded in real time. 2. Description of the Related Art An image file device that reproduces a target in real time and supplies it for broadcasting or editing is used. In such an image file device, when image data is recorded on a recording medium using, for example, a recording device such as a hard disk device and a hard disk device, usually, the image data is continuously recorded on a recording track provided on the recording medium. The data is written to the area (sector).

[0003] However, when the free area of the recording medium is small, image data may be written to discontinuous sectors of the recording medium. Editing device (editor)
Similarly, when the editing process is performed by designating the portions and the order of the image data to be reproduced without changing the recording positions of the plurality of image data recorded discontinuously using the Data is recorded in discontinuous sectors of the recording medium.

As described above, when a plurality of image data that need to be continuously reproduced are recorded in extremely distant recording areas, for example, the outermost sector and the innermost sector of a recording medium, However, after the reproduction of a certain image data is completed, the distance and time (seek distance / time) for moving the reproduction arm to the recording area of the next image data become long. Therefore, in the conventional image file device, there is a problem that the required image data cannot be read out within a certain period of time so that real-time image data cannot be reproduced or an error occurs in the reproduced image data. May occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. When reproducing a plurality of image data recorded in a discontinuous recording area, the seek distance and the time required for the seek are reduced. It is an object of the present invention to provide an image data recording / reproducing apparatus and method capable of reproducing image data as short as possible without error and reliably reproducing real-time image data.

[0006]

In order to achieve the above object, an image data recording / reproducing apparatus according to the present invention is provided with a continuous number corresponding to a position on a predetermined recording medium which can be randomly accessed. The image data is recorded in one or more recording areas, and based on the consecutive numbers assigned to the recording areas, which of the recording areas the image data is recorded in is managed, and the recorded An image data recording / reproducing apparatus which reproduces the recorded image data in response to an external designation for any of the image data, wherein the image data is recorded based on the consecutive numbers of the managed recording areas. The order of access to the recording area for recording the specified image data is set so that the seek distance to the recording medium when accessing An access order determining means for determining, in accordance with the determined access order, accessing the recording area for recording the image data, reproducing the image data, and returning the order of the reproduced image data to the original order; Means.

Preferably, the predetermined recording medium is a disk recording medium having recording tracks provided along a circumference, and the recording area is a sector obtained by dividing the recording track of the disk recording medium. , The consecutive number corresponds to a position in the radial direction of the disk recording medium, and is a sector number continuously assigned to each of the sectors. Sorting means for sorting the order of the sector numbers assigned to the sectors recording monotonically so as to monotonously increase or decrease, and at least the sorted order of the sector numbers assigned to the sectors recording the image data. And a reproduction command issuing means for issuing a reproduction command to the image data reproducing means, wherein the image data reproducing means issues In the order shown is the sector number included in the reproduction instruction, a reproduction means for reproducing the image data by accessing to the sectors, respectively, and output means for outputting the image data reproduced in the original order.

An image data recording / reproducing apparatus according to the present invention records image data of a moving image on a randomly accessible recording medium and reproduces the recorded image data. The recording medium is a disk recording medium such as a hard disk or MO disk having concentric or spiral recording tracks along the circumference, and the recording tracks of the disk recording medium are divided into sectors.

[0009] For example, when the recording track is spiral, sector numbers are continuously assigned to the sectors, and are monotonically increasing from the outer circumference to the inner circumference of the track. The larger the larger, the larger the sector number corresponds to the radial position of the disk recording medium, such that the numbered sector is closer to the inner circumference of the disk recording medium. The image data recording / reproducing apparatus according to the present invention records and reproduces image data in units of sectors, for example, and manages in which sector the recorded image data is recorded by using a sector number for file management.

[0010] The access order determining means, for example, based on the sector number used for managing the sector in which the image data has been recorded, for example, first to fourth images constituting one edited image data in this order. Of the data, first and third image data are recorded on recording tracks near the innermost circumference of the disk recording medium, and second and fourth image data are recorded on recording tracks near the outermost circumference of the disk recording medium. In this case, the seek distance does not depend on the reproduction order of the image data, such as performing access in the order of the second image data, the fourth image data, the first image data, and the third image data. The order of access to the image data is determined so as to be the shortest.

In the access order determining means, when the user performs an operation of designating desired image data and instructing reproduction from a control terminal device or the like, the sorting means records the specified image data. A search is made for the sectors that have been searched, and the sector numbers of the sectors obtained as a result of the search are sorted, for example, in ascending numerical order. The reproduction instruction issuing means generates, for example, data for instructing reproduction, a reproduction instruction in which the sorted sector number is associated with the reproduction data length, and issues the reproduction instruction to the image data reproducing means.

The image data reproducing means responds to the reproduction command issued by the reproduction command issuing means in the order indicated by the sector number of the reproduction command, with the sector indicated by the sector number as the head and the image data having the data amount indicated by the reproduction data length. Are played sequentially,
To buffer. Further, the image data reproducing means includes:
The order of the buffered image data is rearranged to the order to be reproduced and output to the outside.

Further, according to the image data recording / reproducing method according to the present invention, image data is recorded in one or more recording areas each having a continuous number corresponding to a position on a predetermined recording medium which can be randomly accessed. Based on the continuous number assigned to the recording area, manages in which of the recording areas the image data is recorded, and responds to an external designation for any of the recorded image data. An image data recording / reproducing method for reproducing the image data, wherein a seek distance to the recording medium when accessing the image data is the shortest based on the consecutive numbers of the managed recording areas. To determine the order of access to the recording area to record the specified image data, according to the determined order of the access, Serial image data by reproducing the image data by accessing the recording area for recording, undo the order of image data reproduced.

Preferably, the predetermined recording medium is a disk recording medium in which recording tracks are provided along a circumference, and the recording area is a sector obtained by dividing the recording track of the disk recording medium. The consecutive numbers correspond to the order in the radial direction of the disk recording medium, are consecutively assigned to the sectors, and are assigned to the sectors for recording the specified image data. The order of the sector numbers is sorted so as to monotonously increase or decrease, and a reproduction instruction including at least the sector numbers assigned to the sectors for recording the image data in the sorted order is issued and issued. The image data is reproduced by accessing each of the sectors in the order indicated by the sector number included in the reproduction command, and the reproduced image is reproduced. And it outputs the over data in the original order.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment Hereinafter, a first embodiment of the present invention will be described.

The diagram 1 of an image file system 1 is a diagram showing the configuration of an image file system 1 according to the present invention. As shown in FIG. 1, the image file system 1 includes an image data recording / reproducing device 2, a system control device 100, a transmission device 104, and a control line 110 such as a LAN. Image data recording / reproducing device 2
It is composed of a recording device 30 of the RAID configuration including input and output control unit 18 and the n number of hard disk drives (RAID1~n) 30 ₁ ~30 _n. In FIG. 1, n =
5 is shown (the same applies hereinafter).

The image file system 1 records the image data input from the VTR devices 102 ₁ and 102 ₂ and the communication line 120 by using these components, and reproduces the recorded image data in response to a user operation. Then, the reproduced image data is output to the VTR devices 102 ₁ and 102 _{2, the} communication line 120, and the like.

[0018] Configuration FIG. 2 of the image data recording and reproducing apparatus 2 is a diagram showing the structure of an input-output controller 18 of the image data recording and reproducing apparatus 2 shown in FIG. As shown in FIG. 2, the input / output control device 1 of the image data recording / reproducing device 2
8, m pieces of input-output circuit 20 ₁ to 20 _m (hereinafter, m = 6
Is exemplified), the image data bus 32 and the file system 200.

[0019] The image data bus 32, input and output circuit 20 ₁
Downstream bus 34 for transmitting image data from 20 ₆ to the hard disk device 30 ₁ to 30 _5, and consists of up bus 36 for transmitting image data to the input-output circuits 20 ₁ to 20 ₆ from the hard disk device 30 ₁ to 30 ₅ Is done. Each downlink bus 34 and upstream bus 36, a hard disk device 30 ₁ to 30 n the bus 34 to respective _n corresponding _{1 ~34 n, 36 1 ~36 n} ( as mentioned above n = 5
And the input / output circuit 20 _i (1 ≦ i ≦
m; the case where m = 6 as described above) transmits image data to and from the hard disk device 30 _j (1 ≦ j ≦ n) via the buses 34 _j and 36 _j .

The image data recording and reproducing apparatus 2 With these components, the image data divided into frames recorded on the hard disk device 30 ₁ to 30 _5, the user system controller of the image file system 1 100
(FIG. 1) The recorded image data is reproduced in response to a reproduction operation performed via, for example, the VTR device 1.
02 ₁ , 102 ₂ and the transmission device 104.

The diagram 3 of the input and output circuit 20 _i is a diagram showing the structure of an input-output circuit 20 _i of the image file system 1 shown in FIG. 1 (FIG. 2). As shown in FIG. 3, the input / output circuit _20i includes an input processing unit 22, a control unit 24, an output processing unit 26, and an output buffer unit 28. The input processing unit 22 includes a decoder circuit (D1 Decode
r) 220, compression circuit 222, compressed data control circuit 224
And first to third switch circuits (SW1 to SW3) 2
26 to 230.

The control unit 24 includes a control computer 250
And an SDRAM control circuit 248. The control computer 250 includes a control circuit (CPU) 240,
It comprises a RAM 242 and a ROM 246. In practice, the control computer 250 (control circuit 2
40), but the control signals to and from the components of the input-output circuit 20 _i is input and output (input), for simplicity of illustration, in FIG. 3, these control signals are appropriately,
Omitted.

The output processing section 26 comprises a fourth switch circuit (SW4) 260, a decompression circuit 262, and an encoder circuit 264. The output buffer unit 28, n-number of RAM blocks 280 ₁ to 280 _n (RAM corresponding to the respective hard disk device 30 ₁ ~30 _n # 1~ #
5; the case where n = 5 is exemplified as described above).

The components of the image file system 1 The components of the image file system 1 shown in FIGS. 1 to 3 will be described below.

System controller 100 In the image file system 1, the system controller 1
Reference numeral 00 (FIG. 1) denotes, for example, an editing device or a broadcasting station adjustment console, which is connected to the VTR devices 102 ₁ and 102 ₂ , the image data recording / reproducing device 2, and the transmission device 104 in accordance with a user operation. Sends and receives control data via a control line 110 such as a LAN, and controls these operations.

VTR devices 102 ₁ , 102 _{2 The} VTR devices 102 ₁ , 102 ₂ are, for example, digital VTR devices of the D1 system, and use uncompressed image data (audio data to be recorded on a VTR tape (not shown)). May be included) and the input / output circuit 20 _i of the image data recording / reproducing apparatus 2 as a data stream of the D1 system.
(FIG. 2). Also, the VTR device 10
2 ₁ and 102 ₂ record uncompressed image data input as a D1 data stream from the input / output circuit 20 _i of the image data recording / reproducing apparatus 2 on a VTR tape.

The transmission device 104 transmits device 104, for example, SDI system (SMPTE2
59M) image data recording / reproducing device 2 via a transmission path
The non-compressed image data input from the input / output circuit 20 _i is connected to the digital input / output circuit 20 _i via a digital high-speed communication line or an ATM communication line.
The data stream is transmitted as an SDI data stream to a transmission device (not shown) of another broadcasting station. Also, the transmission device 1
04 receives uncompressed image data input as an SDI data stream from a transmission device of another broadcast station or the like via the communication line 120 and sends the data to the input / output circuit 20 _{i of the} image data recording / reproducing device 2. Output.

File system 200 The file system 200 controls the input / output circuit 2 according to the control of the system controller 100 via the control line 110.
0 20 ₁ to 20 ₆ is the recording area of the image data to be recorded in the hard disk device 30 ₁ to 30 _5, to manage for example in sector units. The file system 200, when reproducing the image data designated by the user, the recording area of the designated image data, input and output circuits 20 ₁ to 20 ₆
Notify.

The file system 200 is provided with an input / output circuit 20 based on a reference frame synchronization signal FS supplied from, for example, a clock generator (not shown) and used for synchronizing between devices in a broadcasting station. _i to generate a time slot signal TS indicating a time slot to be allocated to the input / output circuit 2 together with the reference frame synchronization signal FS.
Output for 0 _i .

[0030] In the input-output control unit 18 of the input and output circuit 20 _i image data recording and reproducing apparatus 2, the input-output circuit 20 _i (Fig. 2) is, VTR device 102
₁ , 102 ₂ and non-compressed image data included in the data stream of the D1 system or the SDI system input to the image input terminal from the transmission device 104 or the like, to generate compressed image data by compressing and encoding the generated compressed image data. separating the frame and (interleaved), separating the (interleaved) the compressed image data (SBXOut) one by one frame min, and outputs it to the hard disk device 30 ₁ to 30 ₅ via a bus 34 _{1-34 5,} Record on a randomly accessible hard disk.

Further, input-output circuit 20 _i is a hard disk device 30 ₁ to 30 ₅ are reproduced one by one frame min, receiving the compressed image data supplied via the bus 36 ₁ ~36 _n (SBXIn), multiple (Deinterleaving)
Then, the compressed image data is returned to the original compressed image data, and the returned compressed image data is decompressed to generate non-compressed image data. The data is output from the image output terminal as a D1 or SDI data stream to the VTR device 102 ₁ , 102 ₂ or Output to the transmission device 104 and the like.

[0032] Incidentally, the input-output circuit 20 _i operates in synchronization with the time slot signal TS inputted from the file system 200, the self time slot STS a unique value is allocated in a fixed manner to each input-output circuit 20 _i in the shown time slot (the i-th time slot), to transmit the image data between the hard disk device 30 ₁ to 30 _5.

That is, for example, the file system 200
There when assigning time slots in a cycle of one second with respect to input and output circuits 20 ₁ to 20 _6, respectively, input and output circuits 2
Considering the addition of 0 _i, the number of time slots per cycle is set to 10 (the time length of one time slot is 1/10
Second), the first of these 10 time slots
In each through sixth time slots, input-output circuit 20 ₁ to 20 ₆ for transmitting the image data to a hard disk device 30 ₁ to 30 _5.

The control unit 24 control unit 24 controls the respective components of the input-output circuit 20 _i.

Control Computer 250 In the control unit 24, the control computer 250 is equipped with a multitasking OS and has a reference frame synchronization signal F
S, the time slot signal TS input from the file system 200, and the own time slot signal STS
, And operates in accordance with control data input from the system controller 100 via the control line 110.
Each component of the DRAM control circuit 248 and the input-output circuit 20 _i for controlling in parallel.

SDRAM control circuit 248 The SDRAM control circuit 248
Under the control of 0, the instruction (command) S248 _1, generates a switch control signal S248 ₂ ~248 ₄ and buffering control signal S248 _5, a hard disk device 3
0 ₁ to 30 ₅ , and output to the switch circuits 226 to 230 and 260 and the RAM blocks 280 _{1 to} 280 ₅ .

[0037] Incidentally, the instruction S248 ₁ controls the operation of the recording and reproducing of compressed image data of the hard disk device 30 ₁ to 30 ₅ (recording and playback). FIG. 4 (A) to (C)
A hard disk device 30 ₁ to the input-output circuit 20 _i
It illustrates the format of the instruction S248 ₁ (command and status) to be output to 30 _5.

[0038] When recording the image data, SDRAM control circuit 248, a hard disk device 3 a write command shown in FIG. 4 (A) (command), as an instruction S248 ₁
0 ₁ to 30 ₅ and the file system 200
There is recording new compressed image data in the empty recording area of the hard disk device 30 ₁ to 30 ₅ manage. FIG.
As shown in (A), the write command is a synchronous code
(Sync code), Timeslot ID,
Write flag, number of commands (Num of comm
consists and) address (Adress) and the data length (Length), the compressed image data to be recorded (Data) is output to the hard disk device 30 ₁ to 30 ₅ Following this command.

Of the write commands, the synchronization code (Sync
(code) is a unique code indicating that the data following the synchronization code is an instruction. Time slot identifier
(Timeslot ID) is a self time slot STS of the input and output circuit 20 _i generated instructions used for outputting the compressed image data hard disk device 30 ₁ to 30 ₅ is played to input-output circuit 20 _i Indicates a time slot.

The write flag indicates whether the command is a write command or a read command, and takes a value of 1 if the command is a write command and a value of 0 if the command is not a write command. Number of commands (Num o
f command) indicates the number of instructions following the number of commands.
In the case of a write command, after the number of commands, one set of a head sector number (address; Address) and a data length (Length) of a recording area for recording compressed image data is set.
Since it only continues, the value of the number of commands is 1.

[0041] When reproducing the image data, SDRAM control circuit 248, FIG. 4 read command shown in (B) (command), the instruction S248 ₁ as a hard disk apparatus 3
0 ₁ - 30 and outputted to _5, the compressed image data specified by the user, is reproduced from the recording area of the hard disk device 30 ₁ to 30 ₅ which file system 200 manages.

As shown in FIG. 4B, the read command includes a synchronization code (Sync code) and a time slot identifier.
(Timeslot ID), write flag (Write flag), number of commands (Num of command), and commands 1, 2, ... (comm
and1, command2,…). In the read command, the synchronization code (Sync code) and the time slot identifier (Timeslot ID) are the same as in the above-described write command. The value of the write flag (Write flag) is 1 indicating a read command. Number of commands (Num
of command), respectively the hard disk device 30 ₁ to
30 head of the sector of the compressed image data to read out to _5; and (Address Adress) consists of a combination of the data length (Length) command (command1, command2, ...) it becomes a value corresponding to the number of.

[0043] read status, the hard disk device 30 ₁ to 30 _5, the hard disk device 30 ₁ to 30
_It is used to notify the control computer 250 of the state of No. ₅ .

The switch control signals S248 ₂ , S2
48 _3, the switch circuits 226 and 230, when the switch circuit 228 outputs an instruction S248 ₁ selects the input terminal b side, in other cases and controls so as to select the input terminal a . Also, the switch control signal S24
8 ₄ indicates that the switch circuit 260 outputs the reference frame synchronization signal F
In step S, the input terminals a to e are sequentially selected in each cycle, and the switch circuit 260 is controlled so that the compressed image data input from the selected input terminal is multiplexed (deinterleaved) by one frame. The buffering control signal S248 ₅ controls the buffering operation by switching the frame memories (banks) of the RAM blocks 280 _{1 to} 280 ₅ of the output buffer unit 28.

Input processing unit 22 The input processing unit 22 is a D1 system or S1 input from the VTR devices 102 ₁ , 102 ₂ or the transmission device 104.
Uncompressed image data contained in the data stream DI scheme compression encoding, and outputs to the RAM block 280 _{1-280 5} of the output buffer unit 28.

[0046] In the decoder circuit 220 input processing unit 22, a decoder circuit 220 (FIG. 3)
Is D1 input from the VTR devices 102 ₁ and 102 ₂
And a SDI data stream input from the transmission device 104, and decompresses (interleaves) uncompressed image data having a data rate of about 270 Mbps (of which the image is 180 Mbps). Output to 222. Also,
The decoder circuit 220 includes VTR devices 102 ₁ , 102 ₂
Alternatively, a frame synchronization signal is extracted from the data stream input from the transmission device 104 and output to the compression circuit 222.

Compression circuit 222 The compression circuit 222 operates in synchronization with the reference frame synchronization signal FS and the frame synchronization signal input from the decoder circuit 220, and performs discrete processing on the uncompressed image data input from the decoder circuit 220. Perform compression coding by performing cosine transform (DCT) processing and variable length coding, etc.
Intra-compressed image data having a data rate of about bps is generated and output to the input terminal a of the switch circuit 226.

Compressed data control circuit 224 The compressed data control circuit 224 receives the reference frame synchronization signal F
In synchronization with the S, the switch circuit 228 is a reference frame sync signal FS, for each cycle, sequentially output terminals a to e, selected, relative to RAM block 280 _{1-280 5} the compressed image data from the output terminal selected The switch circuit 2 generates a switch control signal S224 for controlling the
Output to 30 input terminals a.

The compressed data control circuit 224 is configured to change the output terminal selected by the switch circuit 228 in synchronization with the frame synchronization signal generated by the compression circuit 222, as shown by the dotted arrow in FIG. It is also possible. However, the compression circuit 2 for the frame signal FS
Since the delay of the frame synchronization signal generated by the frame 22 is as small as a few bits of the compressed image data, the compressed data control circuit 224 can use either the reference frame synchronization signal FS or the frame synchronization signal generated by the compression circuit 222. ,
The compressed image data input from the compression circuit 222, successively, RAM block 280 _{1-280 5} can generate a switch control signal S224 for controlling the switch circuit 228 to buffer one frame min.

The switching circuit 226 switching circuit 226, as described above, in accordance with the switch control signal S248 _2, when the switch circuit 228 outputs the compressed image data is to select the input terminal a,
The compressed image data input from the compression circuit 222 is output to the input terminal of the switch circuit 228. In addition, the switch circuit 226 determines that the switch S
To output ₁ , the input terminal b is selected and the instruction S
248 ₁ is output to the RAM blocks 280 _{1 to} 280 ₅ .

The switching circuit 230 switching circuit 230, as described above, in accordance with the switch control signal S248 _2, when the switch circuit 228 outputs the compressed image data is to select the input terminal a,
The switch control signal S224 input from the compressed data control circuit 224 is output to the switch circuit 228.
The switch circuit 230, when the switch circuit 228 outputs an instruction S248 ₁ selects the input terminal b side switch control signal S248 ₃ the switching circuit 228
Output to

[0052] The switch circuit 228 switching circuit 228, as described above, operates in accordance with the switch control signal S224, S248, when outputting the compressed image data, the reference frame sync signal FS, for each cycle, the output terminal a To e in order, and the compression circuit 2
The compressed image data input via the switch circuit 226 from 22 is separated into frame units (interleaved) sequentially to the RAM block 280 _{1-280 5} outputs. That is, for example, the output buffer unit 288 outputs the p-th to (p + 4) -th (p is n) of the compressed image data input from the compression circuit 222 via the switch circuit 226.
(5) the frame of the multiple] of outputs from output terminals a to e, and separated (de-interleaving) and outputs to the RAM block 280 _{1-280 5.}

Further, the switch circuit 228 outputs the instruction S24
8 ₁ when outputting the output by selecting one of the terminals a to e, an instruction S248 ₁ inputted from the SDRAM control circuit 248, the purpose of the hard disk device 30 _1-3
And outputs it to 0 _5.

Output processing unit 26 The output processing unit 26 is composed of hard disk devices 30 ₁ to 30 _5.
Reproduces, multiplexes (deinterleaves) compressed image data input in frame units via the RAM blocks 280 _{1 to} 280 ₅ , decompresses and decodes them, and
2 ₁ , 102 ₂ or the transmission device 104.

[0055] The switch circuit 260 switching circuit 260, as described above, in accordance with the switch control signal S248 _4, reference frame sync signal FS, 1
In each cycle, the input terminals a to e are sequentially selected, and the compressed image data input from the selected input terminal is multiplexed (deinterleaved) by one frame at a time, and the original compressed image data is reproduced. That is, for example, the switch circuit 260
Multiplexes (de-interleaves) the p-th to (p + 4) -th frames of the compressed image data input from the RAM blocks 280 _{1 to} 280 ₅ , and outputs the result to the decompression circuit 262.

The expansion circuit 262 expands and decodes the compressed image data input from the switch circuit 260 by performing processing corresponding to the compression circuit 222, generates uncompressed image data, and generates the uncompressed image data. Output to

The encoder circuit 264 encodes the non-compressed image data input from the decompression circuit 262, generates a data stream of the D1 system or the SDI system, and generates the VTR devices 102 ₁ and 102 ₂ or the transmission device 104. Output to

[0058] The output buffer unit 28 output buffer unit 28, a hard disk device 30 _1-3
The compressed image data input from 0 ₅ to output to the switch circuit 260 of the output processing unit 26 is buffered. Further, the output buffer 28, the compressed image data input from the switch circuit 228 of the input processing unit 22 to buffer and outputs it to the hard disk device 30 ₁ to 30 _5.

RAM Block 280 _{j The} RAM block 280 _j stores, for example, one second of compressed image data (30 frames, in the case of the NTSC system).
SDRAM control circuit 248 composed of three frame memories (RAM; banks 1 to 3) having a storage capacity of
It operates according to the control of. SDRAM control circuit 248
Is one of three frame memories of the RAM block 280 _j, is selected via the buffering control signal S248 _5.

[0060] RAM block 280 _j of the selected frame memory, frame by frame compressed image data input from the switch circuit 228 or the hard disk device 30 ₁ to 30 ₅ of the input processing section 22, to buffer. The selected frame memory is stored in the switch circuit 228.
Or one second compressed image data input from the hard disk device 30 ₁ to 30 ₅ (30 frames) Buffering, SDRAM control circuit 248 controls the frame memory selected, the compressed image data buffered The data is output to the corresponding hard disk device _30i or switch circuit 228, and the selection of the frame memory is changed.

That is, for example, the RAM block 280 ₁
280 ₅ respectively, sequentially buffers the p-th to third (p + 4) th frame of the compressed image data switching circuit 228 is interleaved, further, the compressed image data is accumulated 30 frames, the hard disk device 30 ₁ Output to each of 30 ₅ . For example, the RAM blocks 280 _{1 to} 280 ₅ are respectively
The hard disk devices 30 ₁ to 30 ₅ sequentially buffer the p-th to (p + 4) -th frames of the compressed image data reproduced, and output the buffer to the switch circuit 260 of the output processing unit 26.

[0062] The reason why constituted RAM block 280 _i is three frame memories is compressed image data inputted compressed image data input from the hard disk device 30 _j, the switching circuit 228, and a hard disk device 30 ₁ even if the instruction for outputting collides against 30 _5, is so that overflow in RAM block 280 _j does not occur.

[0063] hard disk device 30 ₁ to 30 ₅ the hard disk device 30 ₁ to 30 ₅ operates in accordance with instructions input from the input-output circuit 20 ₁ to 20 ₆ of the input-output control unit 18, the recording from the input-output circuit 20 _i instruction Is input, the compressed image data input from the input / output circuit 20 _i is sequentially recorded frame by frame. That is, for example, a hard disk device 30 ₁ to 30 _5, respectively,
The p-th to (p + 4) th frames of the compressed image data input from the RAM blocks 280 _{1 to} 280 ₅ are stored.

[0064] In addition, the hard disk device 30 ₁ to 30 ₅
When a reproduction command is input from the input / output circuit _20i , the recorded compressed image data is reproduced. For example, after a time slot including the reproduction command and two time slots, the reproduced compressed image data is reproduced. Data is sequentially input / output circuit 2
Output for 0 _i . That is, for example, to play the p-th, second (p + 4) th frame of the compressed image data hard disk device 30 ₁ to 30 _5, respectively, stored,
It outputs to each of the RAM blocks 280 _{1 to} 280 ₅ .

Operation of Image File System 1 The operation of the image file system 1 will be described below with further reference to FIGS.

The recording operation The user operates the system controller 100 (FIG. 1) to specify the file name of the image data, and
02 ₁ , 102 ₂ or the image data recording / reproducing device 2 supplied by the transmission device 104 is instructed to record image data. The system control device 100 controls each component of the image data recording / reproducing device 2 according to a user operation, and prepares for recording of image data.

[0067] That is, according to the control of the system control device 100, any of the input and output circuits 20 ₁ to 20 ₆ of the input-output control unit 18 that the data stream is supplied from the VTR apparatus 102 _1, 102 ₂ or the transmission apparatus 104 ( The SDRAM control circuit 248 of the input / output circuit 20 _i )
To the switch circuit 226 and 230 to select the contact b, the connection of the switch circuit 228 sequentially switches, at the i th time slot, the hard disk device 30 ₁
Relative to 30 _5, respectively, thereby sending a write command shown in FIG. 4 (A). Further, when the transmission of the write command ends, the SDRAM control circuit 248 causes the switch circuits 226 and 230 to select the contact a side.

The VTR devices 102 ₁ and 102 ₂ or the transmission device 104 are connected to the input / output circuit 20 _i (FIGS. 2 and 3).
When a D1 or SDI data stream of 70 Mbps is supplied, the decoder circuit 220 decodes the supplied data stream and outputs a signal of about 180 Mbps.
, And extracts a frame synchronization signal and outputs it to the compression circuit 222. The compression circuit 222 compresses and encodes the non-compressed image data input from the decoder circuit 220 and outputs it to the input terminal of the switch circuit 228.

The SDRAM control circuit 248 sequentially switches the connection of the switch circuit 228 to transfer the compressed image data input from the compression circuit 222 one frame at a time to the RAM.
Output to blocks 280 _{1 to} 280 ₅ . RAM
Block 280 _{1-280 5,} under the control of the SDRAM controller 248 via the buffering control signal S248 _5, when 30 frames buffered compressed image data, and outputs it to the hard disk device 30 ₁ to 30 _5, SDRAM The control circuit 248 changes the selection of the frame memories of the RAM blocks 280 _{1 to} 280 ₅ .

FIG. 5 shows which of the hard disk devices 30 ₁ to 30 ₅ (FIG. 1 and FIG. 2) is to store which frame (Frame) included in each second (sec) of the compressed image data. FIG. Hard disk devices 30 ₁ to 30 ₅
Each is in accordance with the write command, the compressed image data input from the input-output circuit 20 _i of the switch circuit 228 through the RAM block 280 _{1-280 5} by 30 frames in the i th time slot, the address of the write command Recording is performed from the indicated sector to the recording area indicated by the data length.

[0071] The operation of the image file system 1 described above, in the hard disk device 30 ₁ to 30 _5, compressed image data is recorded are interleaved as shown in FIG. In other words, the hard disk device _30j stores the (5th) of the 30 frames of the compressed image data of each second.
× q + j) th frame is recorded (q = 0,...,
4).

Normal Playback Operation Hereinafter, the operation when the image file system 1 performs normal playback (1 × speed playback) of image data will be described. 6, image data recording and reproducing apparatus 2 (FIG. 1, FIG. 2) and the issuance of the read command by the input-output circuit 20 ₁ to 20 ₆ when reproduces the image data, the hard disk device 30 ₁ to 30 ₅
FIG. 5 is a diagram showing the timing of image data reproduction by the CAM.
7, image data recording and reproducing apparatus 2 (FIG. 1, FIG. 2) when to normal playback (normal speed playback) image data, compressed image hard disk device 30 ₁ ~30 ₅ (RAM1~RAM5) reproduces FIG. 3 is a diagram illustrating an example of an order of data frames.

The user operates the system controller 100 (FIG. 1) to specify the file name of the image data,
VTR devices 102 ₁ , 102 ₂ or transmission device 104
Perform an operation to instruct the image data recording / reproducing device 2 supplied by the device to perform normal reproduction of the image data. The system control device 100 controls each component of the image data recording / reproducing device 2 in accordance with a user operation, and prepares for normal reproduction of image data.

[0074] under the control of the system control device 100 described above, the input-output circuit 20 _i of the SDRAM control circuit 248
Is the switch circuits 226 and 230 to select the contact b, further, the connection of the switch circuit 228 sequentially switched, in the i-th time slot as shown in FIG. 6, the hard disk device 30 ₁ to 30 ₅ , FIG.
The read command shown in FIG.
80 through _{1-280 5} sends.

In the case of the normal reproduction (1 × speed reproduction) operation, the SDRAM control circuit 248 of the input / output circuit 20 _i
Is the number of read commands (FIG. 4B) in the i-th time slot based on the recording area managed by the file system 200 so as to cover the entire recording area of the specified compressed image data. (Num o
f command), address (Adress) and data length (Length)
Sent by setting the hard disk device 30 ₁ to 30 ₅
Then, all the frames of the specified compressed image data are reproduced in order.

A specific example will be described. For example, all of the compressed image data that has been designated, the hard disk device 30 ₁ to 30
_{In the} case where the data is recorded in one continuous recording area in SDRAM 5, the SDRAM control circuit 248 sets the value of the number of commands (Num of command) of the read command to 1 and sets the value of the address (Address) to the recording area. and the head of the sector number, as the data length of the compressed image data to the specified data length (length), and sent to the hard disk device 30 ₁ to 30 _5, to reproduce the compressed image data.

[0077] Each of the hard disk device 30 ₁ to 30 ₅ which has received the read command, the read command [FIG 4 (B)] of the address (Adress) and the data length (Length)
Reads the compressed image data indicated by
As shown in FIG. 6, for example, at a two time slots time sequentially from the (i + 3) th time slot, and outputs the same to the output circuit 20 _i. By repeating the above-described operation, the input / output circuit 20 _i causes the (5 × p + j) th of each second of the compressed image data in the order shown in FIG.
Reading a second frame from the hard disk device 30 ₁ to 30 _5, respectively.

[0078] RAM block 280 _{1-280 5} are each buffered frame by frame min compressed image data input from the hard disk device 30 ₁ to 30 _5, and outputs to the switch circuit 260. SDRAM
The control circuit 248 controls the switch circuit 260 via the switch control signal S248 _4, sequential connection of the switch circuit 260 is switched, RAM blocks 280 ₂₁ to
The frame of the compressed image data input from the 80 ₅ multiplexes (deinterleave) and outputs it to the decompression circuit 262 returns the order of the original compressed image data.

The expansion circuit 262 expands and decodes the deinterleaved compressed image data, and outputs the obtained non-compressed image data to the encoder circuit 264. The encoder circuit 264 encodes the non-compressed image data input from the decompression circuit 262, and performs D1 or SDI
And generates a data stream of the VTR system.
Output to 2 ₁ , 102 ₂ and transmission device 104.

The double-speed playback operation will be described below.
Will be described when the image data is reproduced at double speed. FIG. 8 shows the hard disk drive 3 when the image data recording / reproducing apparatus 2 (FIGS. 1 and 2) reproduces image data at double speed.
0 ₁ ~30 ₅ (RAM1~RAM5) is a diagram illustrating the order of the frames of the compressed image data to be reproduced.

The user operates the system controller 100 (FIG. 1) to specify the file name of the image data,
VTR devices 102 ₁ , 102 ₂ or transmission device 104
Is operated to instruct the image data recording / reproducing device 2 supplied by the device to reproduce the image data at double speed. The system control device 100 controls each component of the image data recording / reproducing device 2 in accordance with a user operation, and
Prepare for double speed playback.

As in the case of the normal reproduction, the system controller 1
00, the SDRAM control circuit 248 of the input / output circuit 20 _i sends the switch b, 230
To select the side, further, the connection of the switch circuit 228 sequentially switched, in the i-th time slot as shown in FIG. 6, the hard disk device 30 ₁ to 30
_In FIG. ₅ , the read command shown in FIG.
Send out via blocks 280 ₁ -280 ₅ .

[0083] In addition, the hard disk device 30 ₁ to 30 ₅
The, since the frame of the compressed image data in the order shown in FIG. 4 is recorded, SDRAM control circuit 248, to regenerate the first frame of 0 seconds for a hard disk device 30 _1, the hard disk device 30 ₃ to regenerate the third frame of 0 seconds for, to regenerate the fifth frame of 0 seconds for a hard disk device 30 _5,
To regenerate the seventh frame of 0 seconds for a hard disk device 30 _2, as such to reproduce the ninth frame of 0 seconds for a hard disk device 30 ₄ in the order different from that of the normal playback operation The read command [FIG.
(B)], the number of commands (Num of command) and the address (Adr
ess) and the data length (Length) by setting, it is necessary to output to the hard disk device 30 ₁ to 30 _5.

A specific example will be described. For example, all of the compressed image data that has been designated, the hard disk device 30 ₁ to 30
_Even when the data is recorded in one continuous recording area in ₅ , the DRAM control circuit 248 sets the number of read commands (Numof comma) differently from the normal reproduction.
The value of nd) and 6, by setting the six sets of address (Adress) and the data length (Length) hard disk drive 30 _1-3
And sent to 0 _5, it is necessary to reproduce the compressed image data.

Each of the hard disk devices 30 ₁ to 30 ₅ that have received the read command receives the address (Adress) and data length (Length) of the read command (FIG. 4B).
Reads the compressed image data indicated by
As shown in FIG. 6, sequentially at a two time slots time, it outputs the same to the output circuit 20 _i. By repeating the operation described above, the input-output circuit 20 _i from the hard disk device 30 ₁ to 30 _5, respectively in the order shown in FIG. 8, reads out the frames of the compressed image data in every other frame.

The RAM blocks 280 _{1 to} 280 ₅ store data in the hard disk device 30 ₁ , similarly to the normal reproduction.
The compressed image data input from the 30 ₅ buffers one frame minute, and outputs to the switch circuit 260. SDRAM control circuit 248, the same as in normal playback, controls the switch circuit 260 via the switch control signal S248 _4, sequential connection of the switch circuit 260,
The decompression circuit 262 is switched to deinterleave the frames of the compressed image data input from the RAM blocks 280 _{1 to} 280 ₅ to return to the original compressed image data order.
Output to

The decompression circuit 262, as in the case of normal reproduction,
Decompress and decode the deinterleaved compressed image data,
The obtained uncompressed image data is output to the encoder circuit 264. The encoder circuit 264 encodes the uncompressed image data input from the decompression circuit 262 to generate a data stream of the D1 system or the SDI system as in the case of the normal reproduction, and generates the VTR devices 102 ₁ and 102 _2.
And output to the transmission device 104.

Hereinafter, with further reference to FIGS. 9 and 10, the control computer 25 of the image file system 1 will be described.
0 processing will be described. FIG.
It is a diagram showing the contents of ₁ - 30 first process control computer 250 for reading the compressed image data from the ₅ (S10). FIG. 10 is a diagram showing the contents of the second processing (S12) of the control computer 250 for reading out and outputting compressed image data from the RAM blocks 280 _{1 to} 280 ₅ . The first processing and the second processing shown in FIGS. 9 and 10 are started at the beginning of each cycle of the reference frame synchronization signal FS, and are executed in parallel by the function of the multitask OS of the control computer 250. Can be done.

As shown in FIG. 9, the hard disk drive 3
0 ₁ - 30 when the ₅ performs first processing for reading the compressed image data, at step 100 (S100), the control computer 250, the bank A (the first frame memory by controlling the SDRAM control circuit 248 ) select allow writing compressed image data from the hard disk device 30 ₁ to 30 _5, further the value of the reproduction permission flag to 0. Note that when the value of the reproduction permission flag is 0, RAM from a hard disk device 30 ₁ to 30 ₅
Bank A of block 280 _j (first frame memory)
Until the readout of the compressed image data to the end is completed, the decompression decoding process of the decompression circuit 262 is prohibited.

In step 102 (S 102), the control computer 250 of the input / output circuit 20 _i compares its own time slot signal STS with the time slot signal input from the file system 200, and the two match. S1)
The process proceeds to the process of S04, and if they do not match, the process remains at S102.

[0091] At step 104 (S104), input-output circuit 20 _i control computer 250 is, SDR
By controlling the AM control circuit 248, the number of commands (Num of command) of the read command (FIG. 4B) and the address (A
dress) and data length (Length),
Change the setting as described above in accordance with the 1 × speed reproduction or double-speed or reproduced, and outputs it to the hard disk device 30 ₁ to 30 ₅ through the RAM block 280 _{1-280 5.}

[0092] In step 106 (S106), the hard disk device 30 ₁ to 30 ₅ which has received the read instruction from the input-output circuit 20 _i, reproduces the compressed image data indicated by the read command, two time slots wait output circuit and it outputs the compressed image data played to 20 _i.

In step 108 (S108), the RAM blocks 280 _{1 to} 280 of the input / output circuit 20 _i
5 takes in the compressed image data input from the hard disk device 30 ₁ to 30 _5, and buffers.

In step 110 (S110), R
When the compressed image data for 30 frames is buffered in the AM blocks 280 _{1 to} 280 ₅ , the control computer 250 sets the value of the reproduction permission flag to 1 and permits the decompression circuit 262 to perform the decompression decoding process.

At step 112 (S112), the control computer 250 sets the SDRAM control circuit 248
To switch the banks of the RAM blocks 280 _{1 to} 280 ₅ . That is, until the processing of S110, the bank A
When the (first frame memory) is in the write-permitted state, the bank B (second frame memory) is set in the write-permitted state, and similarly, the banks B and C (the second and second frames) are processed until S110. When the third frame memory is in the write-enabled state, the banks C and A (the third and first frame memories) are set in the write-enabled state.

As shown in FIG. 10, the RAM block 28
0 _{1-280 when 5} reads the compressed image data from performing the second processing for output, step 120 (S12
In 0), the control computer 250
M control circuit 248 to control the RAM blocks 280 _1-
Select 280 ₅ of the bank A (the first frame memory), a state can be read compressed image data from the first frame memory.

In step 122 (S122), control computer 250 determines whether or not the value of the reproduction permission flag is 1. The control computer 250
When the value of the reproduction permission flag is 1, the process proceeds to S124, and when the value of the reproduction permission flag is 0, the control computer 250 remains in the process of S122. That is, the control computer 250, in the processing of S122, RAM block 280 _{1-280 5} of compressed image data in the frame memory is written, waits for the value of the reproduction permission flag becomes 1.

In step 124 (S124), the control computer 250 controls the decompression circuit 262 to change the RAM blocks 280 _{1 to} 280 ₅ according to the reproduction method, that is, the normal reproduction or the double-speed reproduction. The compressed image data for 30 frames buffered in the buffer is decompressed and output via the encoder circuit 264.

In step 126 (S 126), control computer 250 causes SDRAM control circuit 248
And controls the, similarly to the processing in S112, switches the selection of the RAM block 280 _{1-280 5} bank (frame memory).

In the first embodiment, the operation of the image file system 1 has been described by taking the normal reproduction and the double speed reproduction as an example, but the number of read commands (Num of comm.
and), the address (Adress) and the data length (Length) are appropriately changed to make the image file system 1
Can perform a high-speed reproducing operation such as a quadruple-speed reproducing operation such as a triple-speed reproducing operation.

The image file system 1 performs interleaving on a frame-by-frame basis and
0 ₁ - 30 Since ₅ to record the compressed image data, as compared with the case of performing interleaving in units of bytes, requires less number of seek occurs in the hard disk device 30 ₁ to 30 _5. As a specific example, when compressed image data is interleaved in byte units and each frame is recorded in a recording area separated from each other, a maximum of 30 seeks per second are generated for each time slot (NTSC system). in the case of). However, when interleaving is performed on a frame basis as in the image file system 1, even if each frame is recorded in a separate recording area, a maximum of six times (= 30 / m, in the case of the NTSC system) Only seeks. Therefore, according to the image file system 1, it is possible to prevent a problem that compressed image data is lost due to frequent seeks and the quality of a reproduced image is degraded.

Further, for example, the recording method of the image file system 1 is changed so as to record the compressed image data for a plurality of frames, and the occurrence of seek during double-speed reproduction can be further reduced. A specific example will be given. For example, as shown in Table 1 below, to record the first, the second frame of the second hard disk device 30 _1, the hard disk device 30
Each ₂ seconds Third, as such recording the fourth frame, the compressed image data recorded by two frames minutes into the hard disk device 30 ₁ to 30 _5, during the double-speed reproduction, the second from the hard disk device 30 ₁ first, to reproduce the second frame, the fifth from the hard disk device 30 ₃ of each second of
As such reproducing the sixth frame, the compressed image data is reproduced by two frames from the hard disk device 30 ₁ to 30 _5, respectively, the data of 30 frames per second, can be read up to 3 times seek .

[0103]

TABLE 1 RAID1, RAID2, RAID3, RAID4, RAID5 (30 1) (30 2) (30 3) (30 4) (30 5) ================= ============ 0-1, 0-3, 0-5, 0-7, 0-9, 0-2, 0-4, 0-6, 0-8, 0- 10, 0-11, 0-13, 0-15, 0-17, 0-19, ..., ..., ..., ..., 1-1, 1-3, 1-5, 1-7, 1- 9, 1-2, 1-4, 1-6, 1-8 1-10, ··············· (1) where XY is the Yth frame of the Xth second Is shown.

As described above, even when the compressed image data is reproduced and displayed at the interval of two frames, the quality of the image is hardly deteriorated as compared with the case where the compressed image data is reproduced and displayed at the interval of one frame. Thus, the image file system 1
In changes the recording method to record every two or more frames of the compressed image data to each hard disk drive 30 ₁ to 30 _5, by changing the reproduction method, a more high-speed reproduction performed according to the recording method In this case, the number of occurrences of seek can be reduced, and high-speed reproduction can be performed without difficulty.

Further, by further increasing the number of hard disk devices and increasing the apparent recording / reproducing data rate, image files can be recorded and reproduced not only in compressed image data but also in non-compressed image data in real time. The system 1 can be configured. Furthermore, the hard disk device 30 ₁ to 30 _5, for example, equal to substitute other randomly accessible recording apparatus such as a MO device or a DVD device, an image file system 1 can take a variety of configurations.

Second Embodiment Hereinafter, a second embodiment of the present invention will be described.

Background of the Second Embodiment First, the background of the second embodiment of the present invention will be described with reference to FIG. Figure 11 (a), (b) is a diagram illustrating the recording area of the compressed image data in the hard disk device 30 ₁ ~30 ₅ (DISC). In addition, FIG.
In (b), a bold line on the recording medium indicates a recording area of the compressed image data, indicates a reading order, and
To d indicate the order of output (original order). Arm 38 FIG. 11 (a), the (b), the arm 38, the hard disk device 30 ₁ to 30 _5, used to read compressed image data from the recording medium.

In the image file system 1 (FIGS. 1 to 3) shown in the first embodiment, the compressed image data is interleaved in units of frames and recorded on the recording media of a plurality of recording devices. The number of seeks that occurs during normal reproduction or double-speed reproduction can be greatly reduced as compared with the case in which compressed image data can be reproduced stably.

However, as shown in FIG. 11 (a), when the compressed image data to be reproduced in this order includes the portions a to d, Then, when the arm 38 accesses each recording area and reads out the compressed image data in the order of to in the order of reproduction a to d, the arm 38 moves back and forth between the outermost circumference and the innermost circumference of the recording medium. So
The moving distance and moving time (seek distance, seek time) of the arm 38 become longer, and it may be impossible to read out a required amount of compressed image data within a certain time.

The second embodiment of the present invention has been made in view of such a problem.
By improving the operation of the control computer 250 (FIG. 3) and the like in FIG. 1 (see FIG. 1), each recording area is accessed in the order (-) in which the seek distance and seek time are shortened to read the compressed image data. It is an object of the present invention to reliably read a required amount of compressed image data and supply real-time reproduced image data within a predetermined time.

Control Computer in Second Embodiment
Processing such as 250 or less, the operation of the control computer 250 of the image file system 1 in the second embodiment. The operation of the other components of the image file system 1 not shown below is the same as in the first embodiment. In the second embodiment, the control computer 250 accesses the recording areas in the order of the shortest seek distance as described above, based on the recording areas managed by the file system 200, when reproducing the compressed image data. . Note that this portion, in order to simplify the description, a hard disk and a hard disk drive 30 ₁ to 30 rather than _5, illustrating a DVD and DVD device as an example. In the DVD (FIG. 11), recording tracks are provided spirally along the circumferential direction, and the recording tracks are divided into sectors. Each of these sectors is continuously assigned a sector number (sector address) from the outer peripheral side.

Specifically, for example, the sector number 0001h is assigned to the outermost end sector of the recording track, and the sector number 7FFFh is assigned to the innermost end sector of the recording track. Are assigned consecutive sector numbers that increase by one as they go inward.

For example, the sector numbers of the first sectors of the recording areas a to d (FIGS. 11A and 11B) managed by the file system 200 are, for example, 0100, respectively.
h, 7000 h, 0200 h, and 6000 h, the control computer 250 of the input / output circuit 20 _i
When the sector numbers and the data lengths of the first sectors of the recording areas a to d are obtained from the file system 200 during the reproduction of the compressed image data, for example, the recording areas a to d are increased so that the sector numbers monotonously increase. Sort and Figure 11
As shown in FIG. 4B, the number of read commands [FIG. 4B] (Numof comma) is set so that the data is reproduced in the order of the recording areas a, c, d and b, regardless of the reproduction order ad.
nd; 4 in this case, address (Adress; 0100h,
0200h, 6000h, 7000h) and data length
Set (Length), via the SDRAM control circuit 248, and outputs a time slot i the DVD device (hard disk device 30 ₁ to 30 _5).

The hard disk devices 30 ₁ to 30 ₅
In the hard disk used in the first embodiment, the recording tracks are provided concentrically. Similarly, the control computer 250 sorts the sector addresses of the hard disk similarly to the case of the DVD to thereby obtain the DV.
A read command can be generated as in the case of D.

FIG. 12A shows the state of the hard disk device 30.
Part of the compressed image data read out from ₁ to 30 ₅ a to
d (FIGS. 11A and 11B), and FIG.
The order of compressed image data parts a to d (FIGS. 11A and 11B) output from the RAM blocks 280 _{1 to} 280 ₅ is shown.

[0116] hard disk device 30 ₁ to 30 _5, according to the read command input from the input-output circuit 20 _i control computer 250, part of the compressed image data a~d [FIG 11 (a), (b)] and As shown in FIG. 12A, the order sorted based on the sector number of the first sector [the order shown in FIG. 11B, a, c, d,
b] and input / output circuit 20 _i at time slot _i.
Is output to the RAM blocks 280 _{1 to} 280 ₅ . The control computer 250 controls the RAM blocks 280 _{1 to} 280 ₅ via the SDRAM control circuit 248, and as shown in FIG.
0 _1-280 compressed image data input to the _fifth portion a,
The compressed image data is output to the switch circuit 260 by rearranging c, d, and b in the order of reproduction (original order) a to d.

The switch circuit 260, the decompression circuit 262, and the encoder circuit 264 deinterleave the input compressed image data, decompress and decode the input compressed image data, and further encode and perform the D1 or SDI method as in the first embodiment. And output it as a data stream.

Operation of Image File System 1 The operation of the image file system 1 according to the second embodiment will be described below with reference to FIG. FIG.
FIG. 14 is a flowchart illustrating a reproduction process (S14) of the image file system 1 according to the second embodiment.

As shown in FIG. 13, step 140 (S
At 140), the control computer 250 obtains an instruction (command) specifying the file name of the compressed image data from the system control device 100 via the control line 110.

In step 142 (S142), the control computer 250 interprets the command input from the system controller 100, and proceeds to the process of S144 if the command is a reproduction command, and proceeds to S1 if it is a recording command.
Proceed to step 60.

In step 144 (S144), the control computer 250 sends the specified compressed image data to the hard disk drive 3 from the file system 200.
0 ₁ - 30 physical address in _5, i.e. reads the leading sector number and the data length.

In step 146 (S146), the control computer 250 sorts the recording area based on the sector number of the first sector of the recording area for recording each part of the compressed image data, as described above.
Rearrange the seek distance (Fig. 11) so as to be the shortest,
Store that information.

In step 148 (S148), the control computer 250 sets the SDRAM control circuit 248
Through or the like and generates a read command to play the part of the compressed image data in sorted order [FIG 4 (B)], and outputs it to the hard disk device 30 ₁ to 30 _5.

In step 150 (S150), the hard disk devices 30 ₁ to 30 ₅ copy each part of the compressed image data in the order shown in FIG. 11B and FIG. Each part of the reproduced compressed image data is reproduced and stored in the RAM blocks 280 _{1 to} 280
0 output for the _5, writes.

In step 152 (S152), R
3 in the frame memory of the AM blocks 280 _{1 to} 280 ₅
0 If the frame of data is buffered, the control computer 250 controls the RAM block 280 _{1-280 5} via the SDRAM control circuit 248, as shown in FIG. 12 (B), in the order of reproduction Switch circuit 2
60 is output.

In step 154 (S154), the control computer 250 determines whether or not the reproduction of the specified compressed image data has been completed. If the reproduction has not been completed, the process returns to step S146, and the processing ends. In this case, the reproduction process is terminated.

In step 160 (S160), the control computer 250 controls the decoder circuit 220 and the compression circuit 222 to decode the input data stream to generate uncompressed image data, and The data is compressed and encoded to generate compressed image data, and the switch circuits 226 and 228 and the RAM blocks 280 ₁ to 280 2 are transmitted via the SDRAM control circuit 248.
80 ₅ to control the, selected RAM block 280 ₁
Write to 280 ₅ empty bank of (frame memory).

In step 162 (S162), the control computer 250 sets the SDRAM control circuit 248
Control the RAM blocks 280 _{1 to} 280 ₅ through
To output the compressed image data to the hard disk device 30 ₁ to 30 _5.

In step 164 (S164), the control computer 250 determines whether or not the recording of the compressed image data has been completed. If the recording has not been completed, the process returns to step S160. finish.

[0130] As described above, according to the second embodiment of the present invention, as in the first embodiment, and interleaved in byte units to record the compressed image data in the hard disk device 30 ₁ to 30 ₅ Compared to the case, the number of seeks can be greatly reduced, and the seek distance and seek time can be significantly reduced, so that the required amount of compressed image data can be more reliably reproduced within a certain time. be able to. Therefore, according to the second embodiment of the present invention, the degradation of the reproduced image that may occur due to the seek time
It can be reliably prevented.

The second embodiment can be applied not only to a recording / reproducing apparatus that performs interleaving in units of frames as in the image file system 1, but also to a conventional recording / reproducing apparatus that performs interleaving in units of bytes. Can be. It should be noted that modifications similar to those of the first embodiment can be made to the second embodiment of the present invention.

[0132]

As described above, according to the image data recording / reproducing apparatus and method of the present invention, when reproducing a plurality of image data recorded in discontinuous recording areas, the seek distance and Image data can be reproduced without error by minimizing the time required for seeking, and real-time image data can be reproduced reliably.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an image file system according to the present invention.

FIG. 2 is a diagram showing a configuration of an input / output control device of the image data recording / reproducing device shown in FIG.

FIG. 3 is a diagram showing a configuration of an input / output circuit (FIG. 2) of the image file system shown in FIG.

FIGS. 4A to 4C are diagrams illustrating a format of a command S248 ₁ (command and status) output from the input / output circuit to the hard disk device.

FIG. 5 is a diagram showing which number of a frame (Frame) included in each second (sec) of compressed image data is recorded on which of the hard disk devices (FIGS. 1 and 2).

FIG. 6 is a diagram showing the timing of issuance of a read command by an input / output circuit and reproduction of image data by a hard disk device when the image data recording / reproducing device (FIGS. 1 and 2) reproduces image data.

FIG. 7 shows the order of frames of compressed image data to be reproduced by the hard disk devices (RAM1 to RAM5) when the image data recording / reproducing device (FIGS. 1 and 2) performs normal reproduction (1 × speed reproduction) of image data. FIG.

FIG. 8 is a diagram exemplifying the order of frames of compressed image data reproduced by hard disk devices (RAM1 to RAM5) when the image data recording / reproducing device (FIGS. 1 and 2) reproduces image data at double speed. is there.

FIG. 9 is a diagram showing the contents of a first process (S10) of a control computer for reading compressed image data from a hard disk device.

FIG. 10 is a second process (S1) of the control computer for reading and outputting compressed image data from the RAM block.
It is a figure which shows the content of 2).

FIGS. 11A and 11B are diagrams illustrating recording areas of compressed image data on a hard disk (DISC) of a hard disk device.

12A shows the order of compressed image data portions a to d (FIGS. 11A and 11B) read from the hard disk device (FIGS. 1 and 2), and FIG. RAM
Portions a to d of compressed image data output from blocks
[FIG. 11A, FIG. 11B] are shown.

FIG. 13 is a flowchart illustrating a reproduction process (S14) of the image file system according to the second embodiment.

[Explanation of symbols]

1 ... image file system, 100 ... system control unit, 102 _1, 102 ₂ ... VTR apparatus, 104 ... transmission device, 2 ... image data recording and reproducing apparatus, 18 ... input-output controller, 20 ₁ to 20 ₆ ... O Circuit, 22: input processing unit, 220: decoder circuit, 222: compression circuit, 224
... compressed data control circuit, 226 to 230 ... switch circuit, 24 ... control unit, 240 ... control circuit, 242 ... RA
M, 246: ROM, 248: SDRAM control circuit, 2
6 output processing section, 260 switch circuit, 262 expansion circuit, 264 encoder circuit, 28 output buffer section, 280 _{1 to} 280 ₅ RAM block, 200 file system, 32 image data bus, 34 downlink Bus, 34 _{1 to} 34 ₅ ... bus, 36 ... up bus, 36 ₁ to
36 ₅ ... bus, 30 ... recording device, 30 ₁ to 30 ₅ ... hard disk drive.

Claims (4)

[Claims] An image data is recorded in one or more recording areas each having a continuous number corresponding to a position on a predetermined recording medium which can be randomly accessed, and said continuous area attached to said recording area is recorded. Image data for managing which image data is recorded in which recording area based on a number, and reproducing the recorded image data according to an external designation for any of the recorded image data A recording / reproducing device, based on the consecutive numbers of the managed recording areas,
Access order determining means for determining the order of access to the recording area for recording the specified image data so that the seek distance to the recording medium at the time of accessing the image data is minimized; An image data recording / reproducing device comprising: an image data reproducing unit that accesses the recording area for recording the image data according to an access order, reproduces the image data, and restores the order of the reproduced image data. 2. The recording medium according to claim 1, wherein the predetermined recording medium is a disk recording medium having recording tracks provided along a circumference, the recording area is a sector obtained by dividing the recording track of the disk recording medium, The consecutive numbers correspond to the positions in the radial direction of the disk recording medium, and are consecutively assigned sector numbers, and the access order determining means records the designated image data. Sorting means for sorting the order of the sector numbers assigned to the sectors to be monotonically increased or decreased; and at least the sector numbers assigned to the sectors for recording the image data in the sorted order. Play instruction,
A reproduction command issuing unit for issuing to the image data reproducing unit, wherein the image data reproducing unit accesses each of the sectors in an order indicated by a sector number included in the issued reproduction instruction, 2. The image data recording / reproducing apparatus according to claim 1, further comprising: reproducing means for reproducing the image data; and output means for outputting the reproduced image data in an original order. 3. The image data is recorded in one or more recording areas each having a continuous number corresponding to a position on a predetermined recording medium which can be randomly accessed. An image data recording / reproducing device that manages, based on a number, in which of the recording areas the image data is recorded, and reproduces the image data in response to an external designation for any of the recorded image data. A playback method, based on the consecutive numbers of the managed recording areas,
In order to minimize the seek distance to the recording medium when accessing the image data, determine the order of access to the recording area to record the specified image data, according to the determined order of the access, An image data recording / reproducing method in which the recording area for recording the image data is accessed, the image data is reproduced, and the order of the reproduced image data is restored. 4. The predetermined recording medium is a disk recording medium in which recording tracks are provided along a circumference, the recording area is a sector obtained by dividing the recording track of the disk recording medium, The continuous numbers correspond to the order in the radial direction of the disk recording medium, are the sector numbers continuously assigned to the sectors, and are assigned to the sectors that record the specified image data. The order of the sector numbers is sorted so as to monotonously increase or decrease, and a playback command including at least the sector numbers assigned to the sectors for recording the image data in the sorted order is issued. Accessing the respective sectors in the order indicated by the sector numbers included in the instruction, reproducing the image data, and reproducing the reproduced image data Claim output in original order 3
The image data recording / reproducing method described in 1.